45,300,000 in scientific notation

4.53*10^7

Explanation:
When writing a number in scientific number, we want to keep moving the decimal place left until the number is less than 10.

In this case, we would have to move the decimal place left 7 times.

45,300,000 —> 4.53

Because we moved the decimal place left seven times, we need to multiply 4.53 by 10 to the seventh power.

4.53*10^7

I hope this helps!